MC908AB32CFUE

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1. Describe

The MC68HC908AB32 is a low-cost, high-performance member The M68HC08 family of 8-bit microcontroller units (MCUs) with embedded EEPROM for user data storage. All MCUs in this family use the enhanced M68HC08 central processing unit (CPU08) and are available in a variety of modules, memory sizes and types, and package types.

2. Feature

    1. High-performance M68HC08 architecture

    2. with M6805, M146805 and M68HC05 series

    3. MC68HC08AB32 compatible memory map and pin functions and MC68HC08AB16

    4. 8MHz internal bus frequency

    5. 32K bytes user program flash memory with security 1 function

    6. 512-byte on-chip EEPROM with security features

    7. 1K bytes of on-chip RAM

    8. Clock Generator Module (CGM)

    9. Two 16-bit, 4-channel timer interface modules (TIMA and TIMB) With optional input capture, output compare and PWM Capability of each channel

  10. Programmable Interrupt Timer (PIT)

  11. Serial Peripheral Interface Module (SPI)

  12. Serial Communication Interface Module (SCI)

  13. 8 channels. 8-bit analog-to-digital converter (ADC)

  14. Low power design (completely static with STOP and WAIT modes)

  15. Master reset pin and power-on reset

  16. 51 general-purpose input/output (I/O) pins:

        – 30 shared function I/O pins

        – 5-digit keyboard wake-up port

        – Optional pull-up resistors on Port D and Port F inputs

  17. System protection function

        – Optional Computer Operational (COP) reset

        – Low voltage detection with optional reset

        – Illegal opcode detection, optional reset 

        – Illegal address detection, optional reset

  18. 64-pin Quad Flat Pack (QFP)

3. Pin configuration

4. Features of the CPU08 include

    1. Enhanced HC05 programming model

    2. Extensive loop control capabilities

    3. 16 addressing modes (8 more than HC05)

    4. 16-bit index register and stack pointer

    5. Memory-to-memory data transfer

    6. Fast 8 × 8 multiply instruction

    7. Fast 16/8 divide instruction

    8. Binary Coded Decimal (BCD) instructions

    9. Optimization of controller applications

  10. Efficient C language support

5. Function Description

Addresses $0050 to $044F are RAM locations. The location of the stack RAM is programmable. The 16-bit stack pointer allows the stack to be located anywhere in the 64K byte memory space. Because stack RAM locations are programmable, all page zero RAM locations are available for I/O control and user data or code. Direct addressing mode instructions can effectively access all zero page RAM locations when the stack pointer is moved out of the zero page from its reset location $00FF. Therefore, page zero RAM provides an ideal location for frequently accessed global variables. The five bytes of the stack are used by the CPU to hold the contents of the CPU registers before processing an interrupt.